Re: My left calf when i run HURTS ! why?
Well I guarantee you're not going to get the answer on an online forum.
A couple of possibilities (out of hundreds): maybe you're planting your feet differently in anticipation of the pain. A subconscious adjustment could be undetectable to you, but totally manifest itself into actual pain.
Or a more serious possibility, compartmentalism.
In any case, if the symptoms persist for longer than a week, consult another website......just kidding.....go see a doctor.